Method for producing a grain-oriented electrical steel sheet having a mirror surface and improved core loss
US5509976A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1995 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Jul 17, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1272
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a method for producing a grain-oriented electrical steel sheet having mirror surface containing 0.8 to 4.8% of Si in the form of a strip which has been subjected to a conventional series of operations including hot rolling with or without annealing, cold rolling once or at least twice with intermediate annealing to obtain a final thickness, decarburization annealing with or without nitriding treatment, coating the steel sheet with an annealing separator mainly containing non-hydrating oxide and final annealing, the improvement comprising: PA1 satisfying the relationship PA1 A!>0.2.times. O! PA1 where A! is the total concentration of alkali metal impurity in the annealing separator (weight %), and PA1 O! is the amount of oxygen contained in the steel sheet just prior to the final annealing (g/m.sup.2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.